Somebody on Freenode wanted this:

   Source            Result
+----+------+    +----+------+
| id | x    |    | id | c    |
+----+------+    +----+------+
|  1 |    1 |    |  1 |    2 |
|  2 |    1 |    |  2 |    2 |
|  3 | NULL |    |  3 | NULL |
|  4 | NULL | -> |  4 | NULL |
|  5 |    1 |    |  5 |    1 |
|  6 | NULL |    |  6 | NULL |
|  7 |    1 |    |  7 |    3 |
|  9 |    1 |    |  9 |    3 |
| 10 |    1 |    | 10 |    3 |
+----+------+    +----+------+

The result uses the NULL values in x as boundaries of windows, and counts the number of rows within each window. I don’t know why anyone wants such a thing; it is not ours to reason why…

Anyway, the point is that you can use arbitrary expressions, even subqueries, to define your window partitions.

SELECT 
    id, 
    -- Count of rows in windows bound by NULL values in x
    IF(
      x IS NULL, 
      NULL, 
      COUNT(*) OVER (PARTITION BY (
        -- …

If you’re here, that probably means you’re about to acquire some sensitive data to take care of. Or that you’ve already acquired it and are protecting it, and you want to see how MySQL Enterprise Data Masking and De-Identification features can help you do it in an easier, better and more efficient manner.…

As promised, here are slides about MySQL 8.0 Performance from my talks at Oracle Open World 2018 and Percona LIVE Europe 2018 -- all is combined into a single PDF file to give you an overall summary about what we already completed, where we're going in the next updates within our "continuous release", and what kind of performance issues we're digging right now.. ;-))
Also, I'd like to say that both Conferences were simply awesome, and it's great to see a constantly growing level of skills of all MySQL Users attending these Conferences ! -- hope you'll have even more fun with MySQL 8.0 now ;-))

Welcome to Wednesday at Percona Live Europe 2018! Today is the final day! Check out all of the excellent sessions to attend.

Please see the important updates below.

Download the conference App

If you haven’t already downloaded the app, go to the app store and download the official Percona Live App! You can view the schedule, be alerted for any important updates, create your own personalized schedule, rate the talks and interact with fellow attendees.

For Apple: Download here
For Android:  …

Common Table Expressions (CTEs) are a very useful tool and frankly a big improvement on sub-queries.  But there are differences in how they are implemented in MySQL and MariaDB.  That  is not too surprising since the code fork many years ago. Different engineers implementing the same idea will have different approaches (and sometimes results). But differences in implementation are often important and, in this case, shockingly different.

Jesper Wisborg Krogh at Oracle OpenWorld and CodeOne gave a series of presentations and hands on labs that were excellent. He is an amazing Support Engineer and a great presenter of material at conferences.  In the lab for Common Table Expressions he did point out to me an interesting problem in MariaDB's implementation of CTEs. 

The Problem In a Nutshell
On the PostgreSQL Wiki, there is a
an SQL query (requires PostgreSQL 8.4 or MySQL 8.0) that …

Hello, open source database enthusiasts at Percona Live Europe 2018! There is a lot to see and do today, and we’ve got some of the highlights listed below.

On Facebook? Go here for some pics that captured the action on Percona Live Europe 2018 Tutorials day (Monday, Nov. 5, 2018). 

Download the Conference App

We apologize for the confusion yesterday on the app but can assure you, the schedule and timings have been updated! If you haven’t already downloaded the app, go to the app store and download the official Percona Live App! You can view the schedule, be alerted for any …

Quickly Add a Node to an InnoDB Cluster or Group Replication (Shutterstock)

In this blog, we’ll look at how to quickly add a node to an InnoDB Cluster or Group Replication using Percona XtraBackup.

Adding nodes to a Group Replication cluster can be easy (documented here), but it only works if the existing nodes have retained all the binary logs since the creation of the cluster. Obviously, this is possible if you create a new cluster from scratch. The nodes rotate old logs after some time, however. Technically, if the

gtid_purged

 set is non-empty, it means you will need another method to add a new node to a cluster. You also …

Paytrail

“Galera Cluster has supported our growth all the way from a small number of transactions to high volume  traffic. Since 2012 our payment service with Galera has processed over 4 billion euros worth of product and service sales. Today we help 10 000+ webshops and online services in several countries to provide a pleasant shopping experience to their customers”

THINQ

“We’re very happy how Galera Cluster facilitated automated failover eliminating downtime for THINQ services that programmatically route millions of phone calls. The comprehensive Codership documentation includes, for example, the AppArmor package settings necessary to make Galera Cluster nodes more secure. ”

North Carolina based, THINQ is a cloud-based software company that develops Business as a Service (BaaS) solutions for the telecommunications industry. Partners …

Tweet

A framework can be a great way to allow you to spend more time on the actual application or web site and less time on standard tasks. It can also greatly reduce the amount of custom code needed. Django is one of the best known web frameworks for Python, and the good news is that it works out of the box with MySQL Server 8 and MySQL Connector/Python 8. This blog will look at how to use Django with MySQL 8.

There actually is very little to get Django to work with MySQL 8. Just install it, configure Django to use MySQL Connector/Python as a backend, and that’s it. From the Django point of view, you just have to configure the database option in settings.py to use MySQL Connector/Python and your database settings, for example:

DATABASES = { …

We are happy to announce that there will be a MySQL Day/MySQL Community Meetup hold in Oracle Buliding in Vienna on November 8th. Please find more details below:

• Date: Thursday, November 8th, 2018 
• Time: 7pm - 9pm
• Address: Oracle Office DC Tower 1, Donau-City-Straße 7, 1220 Wien, Österreich
• Meeting room: will be confirmed soon. 
• Agenda: 
  • "Oracle MySQL 8 - The next big thing!" by Carsten Thalheimer the Master Principal Sales Consultant 
  • Discussion & pizza 
• More information & Registration